briefly: add weight when I complete all 8,8,8,8 reps? and even though I can do 2 more reps on 1st set, and 1 more rep on 2nd I do only planned reps, correct?

im asking you because ssome people say it is a bad way, because you could do 2-3 more reps on the 1st set , but you dont do it

for example:

my routine states that I should do 4 sets 10 reps of weighted pullups.

for now my max is (only bodyweight): 9 reps, 7 reps, 5 reps, 5 reps

so should I wait and try to add reps each workout till I get all 10, 10, 10, 10 and then start to adding weight and get sth like 10, 9, 8, 7 and next time 10,10,10,8 etc. and up weight again when i reach 10,10,10,10